Sieving hydrogen isotopes through two-dimensional crystals.
M. Lozada-Hidalgo,S. Hu,Owen P. Marshall,Artem Mishchenko,Alexander N. Grigorenko,Robert A. W. Dryfe,Boya Radha,Irina V. Grigorieva,Andre K. Geim +8 more
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TLDR
It is shown that monolayers of graphene and boron nitride can be used to separate hydrogen ion isotopes, and the demonstrated approach offers a competitive and scalable way for hydrogen isotope enrichment.Abstract:
One-atom-thick crystals are impermeable to atoms and molecules, but hydrogen ions (thermal protons) penetrate through them. We show that monolayers of graphene and boron nitride can be used to separate hydrogen ion isotopes. Using electrical measurements and mass spectrometry, we found that deuterons permeate through these crystals much slower than protons, resulting in a separation factor of ≈10 at room temperature. The isotope effect is attributed to a difference of ≈60 milli–electron volts between zero-point energies of incident protons and deuterons, which translates into the equivalent difference in the activation barriers posed by two-dimensional crystals. In addition to providing insight into the proton transport mechanism, the demonstrated approach offers a competitive and scalable way for hydrogen isotope enrichment.read more
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Ion sieving in graphene oxide membranes via cationic control of interlayer spacing
Liang Chen,Guosheng Shi,Jie Shen,Bingquan Peng,Bowu Zhang,Yuzhu Wang,Fenggang Bian,Jiajun Wang,Deyuan Li,Deyuan Li,Zhe Qian,Gang Xu,Gongping Liu,Jianrong Zeng,Lijuan Zhang,Y. Yang,Guoquan Zhou,Minghong Wu,Wanqin Jin,Jingye Li,Haiping Fang +20 more
TL;DR: Here, cationic control of the interlayer spacing of graphene oxide membranes with ångström precision is demonstrated using K+, Na+, Ca2+, Li+ or Mg2+ ions, suggesting that other ions could be used to produce a wider range of interlayer spacings.
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Two dimensional hexagonal boron nitride (2D-hBN): synthesis, properties and applications
TL;DR: There are a wide variety of processing routes that have been developed for 2D-hBN, including also those for doping, substitution, functionalization and combination with other materials to form heterostructures or h-BNC hybrid nanosheets, which are systematically elaborated for novel functions.
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Two-Dimensional-Material Membranes: A New Family of High-Performance Separation Membranes.
TL;DR: These are the latest ground-breaking studies in 2D-material membranes as nanosheet and laminar membranes, with a focus on starting materials, nanostructures, and transport properties.
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Fundamental transport mechanisms, fabrication and potential applications of nanoporous atomically thin membranes
Luda Wang,Michael S. H. Boutilier,Piran R. Kidambi,Doojoon Jang,Nicolas G. Hadjiconstantinou,Rohit Karnik +5 more
TL;DR: T theoretical and experimental developments in the emerging field of nanoporous atomically thin membranes are discussed, focusing on the fundamental mechanisms of gas- and liquid-phase transport, membrane fabrication techniques and advances towards practical application.
Journal ArticleDOI
Synthesis challenges for graphene industry.
Li Lin,Hailin Peng,Zhongfan Liu +2 more
TL;DR: This Comment discusses relevant issues for industrial-scale graphene synthesis, one of the critical aspects for the future graphene industry.
References
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TL;DR: Light scattering experiments revealed that the radius of gyration had a linear dependence on the molar mass of the aggregates, which suggests that the particles are in the form of rods or ribbons, or at least some elongated structure.
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TL;DR: This pressurized graphene membrane is the world's thinnest balloon and provides a unique separation barrier between 2 distinct regions that is only one atom thick.
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Proton Conductivity: Materials and Applications
TL;DR: In this paper, a review of the proton conductivity in materials and the elements of proton conduction mechanisms are discussed with a special emphasis on proton chemistry, including structural reorganization and diffusional motion of extended moieties.